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Just like the name suggests it's the second consumer in a food web or food chain that eats the primary consumers or the producers.
The physical characteristics that determine the exhistance of organisms in aquatic enrironments relate to its pH (which is whether it's acid, neutral or basic), the water clearance (which refers to the particles diluted in it, the presence of toxic substances, etc), the presence of predators (bio chain) and also if there's enough food for the organisms to live, to reproduce and if the water temperature allows them to subsist or if they need to migrate within a year, due to the natural changes.
2. In cell biology, MITOSIS is part of the cell cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, and each set ends up in its own nucleus.
3.In females, MEIOSIS occurs in cells known as oogonia (singular : oogonium). Each oogonium that initiates MEIOSIS divides twice, unequally in each case. The first division results in a small "first polar body" and a much larger daughter cell. that's all I know sorry :)
